[best]

12 steps work for smoking as well.

As to any weight gain. Digestion speeds up once the nicotine is gone from our system. The stopping the smoking is healthier then 50 lbs added. To drop the weight once the smoking is under control will be easier then if still smoking.
As to the pain you may be feeling, when we stop and start and stop and start, the body is starting to heal itself on day one. Ciggerette one starts to hurt the body right away. A sore throat, bronchitis, heavy feeling in the lungs. The body has gone into repair mode and then we put a smoke inside again, the body needs to change gears.
A cough does increase when first stopping. That is part of the healing. The body is fixing itself with each cough.

As you have found... don't pick up that first one is the best way to remain stopped.